CVE-2021-26828
OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability - [Actively Exploited]
Description
OpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows remote authenticated users to upload and execute arbitrary JSP files via view_edit.shtm.
INFO
Published Date :
June 11, 2021, 12:15 p.m.
Last Modified :
Dec. 4, 2025, 2:47 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
OpenPLC ScadaBR contains an unrestricted upload of file with dangerous type vulnerability that allows remote authenticated users to upload and execute arbitrary JSP files via view_edit.shtm.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/SCADA-LTS/Scada-LTS/pull/2174 ; https://nvd.nist.gov/vuln/detail/CVE-2021-26828
Affected Products
The following products are affected by CVE-2021-26828
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Public PoC/Exploit Available at Github
CVE-2021-26828 has a 15 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-26828.
| URL | Resource |
|---|---|
| http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 | Exploit Vendor Advisory Broken Link |
| http://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-Upload.html | Exploit Third Party Advisory |
| https://youtu.be/k1teIStQr1A | Exploit Third Party Advisory |
| http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 | Exploit Vendor Advisory Broken Link |
| http://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-Upload.html | Exploit Third Party Advisory |
| https://youtu.be/k1teIStQr1A | Exploit Third Party Advisory |
| https://github.com/SCADA-LTS/Scada-LTS/pull/2174 | Issue Tracking Patch |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26828 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-26828 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-26828
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
All-in-one ICS/SCADA hacking, red teaming, malware analysis, detection, and lab architecture cheat sheet
cheatsheet detection-engineering exploitation hacking ics ics-security industrial-cybersecurity malware-simulation mitre-attack ot playbook scada scada-security security-tools stuxnet triton ladder-logic-analysis plc-hacking critical-infrastructure-protection ot-security
Python Zeek
None
None
Python
ScadaFlare Authenticated RCE Exploit Framework for ScadaBR (CVE-2021-26828) OpenPLC ScadaBR
alchemy ctf exploit htb ics redteam reverse-shell scada scadabr cve-2021-26828 exploitation htb-scripts ics-security scada-security
Python
None
HTML Python Shell
A client for gathering vulnerability-related information from GitHub Gists.
Python Dockerfile
All CVE - PoC in GitHub
poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate
None
None
Dockerfile Shell Python HTML Roff CSS Smalltalk C++ MATLAB
None
Python
None
None
None
None
None
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-26828 vulnerability anywhere in the article.
-
CybersecurityNews
CISA Warns of OpenPLC ScadaBR File Upload Vulnerability Exploited in Attacks
Critical vulnerability has been added to CISA’s Known Exploited Vulnerabilities list, warning organizations about a dangerous file-upload flaw in OpenPLC ScadaBR systems. The vulnerability allows remo ... Read more
-
Daily CyberSecurity
Pro-Russian Hacktivist Group TwoNet Exposed for Fabricating Critical Infrastructure Attacks to Boost Reputation
Forescout Research has uncovered a disturbing new tactic among pro-Russian hacktivists — fabricating real-world critical infrastructure attacks to inflate their reputation. In a recent case, a newly f ... Read more
The following table lists the changes that have been made to the
CVE-2021-26828 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Dec. 04, 2025
Action Type Old Value New Value Added CPE Configuration AND OR *cpe:2.3:a:scadabr:scadabr:*:*:*:*:*:*:*:* versions up to (including) 0.9.1 OR cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:a:scadabr:scadabr:*:*:*:*:*:*:*:* versions up to (including) 1.12.4 OR cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Removed CPE Configuration OR *cpe:2.3:a:openplcproject:scadabr:*:*:*:*:*:linux:*:* versions up to (including) 0.9.1 *cpe:2.3:a:openplcproject:scadabr:*:*:*:*:*:windows:*:* versions up to (including) 1.12.4 Changed Reference Type MITRE: http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Types: Exploit, Vendor Advisory MITRE: http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Types: Broken Link, Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/SCADA-LTS/Scada-LTS/pull/2174 Types: Issue Tracking, Patch Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26828 Types: US Government Resource Changed Reference Type CVE: http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Types: Exploit, Vendor Advisory CVE: http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Types: Broken Link, Exploit, Vendor Advisory -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Dec. 04, 2025
Action Type Old Value New Value Added Date Added 2025-12-03 Added Due Date 2025-12-24 Added Required Action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Added Vulnerability Name OpenPLC ScadaBR Unrestricted Upload of File with Dangerous Type Vulnerability -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Dec. 03, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-434 Added Reference https://github.com/SCADA-LTS/Scada-LTS/pull/2174 Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26828 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Added Reference http://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-Upload.html Added Reference https://youtu.be/k1teIStQr1A -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jun. 21, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 No Types Assigned http://forum.scadabr.com.br/t/report-falhas-de-seguranca-em-versoes-do-scadabr/3615/4 Exploit, Vendor Advisory Changed Reference Type http://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-Upload.html No Types Assigned http://packetstormsecurity.com/files/162564/ScadaBR-1.0-1.1CE-Linux-Shell-Upload.html Exploit, Third Party Advisory Changed Reference Type https://youtu.be/k1teIStQr1A No Types Assigned https://youtu.be/k1teIStQr1A Exploit, Third Party Advisory Added CWE NIST CWE-434 Added CPE Configuration OR *cpe:2.3:a:openplcproject:scadabr:*:*:*:*:*:linux:*:* versions up to (including) 0.9.1 *cpe:2.3:a:openplcproject:scadabr:*:*:*:*:*:windows:*:* versions up to (including) 1.12.4
Vulnerability Scoring Details
Base CVSS Score: 8.8
Base CVSS Score: 6.5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
80.12 }} -1.43%
score
0.99066
percentile